At least four people got virus after tainted infusions, officials say

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Judith Rivera, who was infected with HIV by a blood transfusion at a public hospital, talks during a news conference as Peru's Health Deputy Minister Jose Calderon looks on at the health ministry in Lima on Sept. 13, 2007.

A Health Ministry investigation found that Judith Rivera, a 44-year-old mother of four, was infected with the virus after receiving blood transfusions during an operation for a tumor in her uterus in April at a state hospital in Callao, Lima's port city.

Vallejos confirmed three other cases, including that of an 11-month-old infant, all at the same hospital.

On Thursday, a 17-year-old boy told local media that he was also infected with HIV after receiving a transfusion at the hospital, but the ministry had not yet confirmed the case.

Jose Cruz, an adviser on blood and laboratory safety for the Washington-based Panamerican Health Organization, called Peru's blood banks "worrying."